The University of Southampton
University of Southampton Institutional Repository

Mechanisms of generation of the 2f2-f1 distortion product otoacoustic emission in humans

Mechanisms of generation of the 2f2-f1 distortion product otoacoustic emission in humans
Mechanisms of generation of the 2f2-f1 distortion product otoacoustic emission in humans
The 2f1–f2 distortion product otoacoustic emission (DPOAE) is considered to consist of two components in normally hearing ears, one having constant phase with changing DP frequency (wave fixed) and one having an increasing phase lag with increasing frequency (place fixed). The aim was to identify the wave-fixed and place-fixed components of both 2f1–f2 and 2f2–f1 DPs, and, in particular, to show whether a wave-fixed 2f2–f1 DP exists in normally hearing adults. DPOAE recordings were made in 20 ears of normally hearing young adults. Four frequency ratios were used and recording entailed fixed frequency-ratio sweeps. A separation into wave-fixed and place-fixed components was carried out using a time-window separation method. A method for estimating the noise floor after data processing was developed. Results confirmed the presence of wave-fixed and place-fixed components for 2f1–f2, consistent with previous studies. Both components were also present for 2f2–f1 in virtually all subjects. This latter finding conflicts with current models of DPOAE generation, and so a modified model is proposed. Unlike the 2f1–f2 emission, which has a wave-fixed component that is strongly dependent on the frequency ratio, neither component of the 2f2–f1 emission showed such a dependence. The proposed model explains these findings in terms of the overlap of the primary frequency traveling waves.
0001-4966
2108-2115
Wilson, Hanna K.
100739cb-ca4f-4f2a-92a6-082be758da0f
Lutman, Mark E.
Wilson, Hanna K.
100739cb-ca4f-4f2a-92a6-082be758da0f
Lutman, Mark E.

Wilson, Hanna K. and Lutman, Mark E. (2006) Mechanisms of generation of the 2f2-f1 distortion product otoacoustic emission in humans. Journal of the Acoustical Society of America, 120 (4), 2108-2115. (doi:10.1121/1.2335421).

Record type: Article

Abstract

The 2f1–f2 distortion product otoacoustic emission (DPOAE) is considered to consist of two components in normally hearing ears, one having constant phase with changing DP frequency (wave fixed) and one having an increasing phase lag with increasing frequency (place fixed). The aim was to identify the wave-fixed and place-fixed components of both 2f1–f2 and 2f2–f1 DPs, and, in particular, to show whether a wave-fixed 2f2–f1 DP exists in normally hearing adults. DPOAE recordings were made in 20 ears of normally hearing young adults. Four frequency ratios were used and recording entailed fixed frequency-ratio sweeps. A separation into wave-fixed and place-fixed components was carried out using a time-window separation method. A method for estimating the noise floor after data processing was developed. Results confirmed the presence of wave-fixed and place-fixed components for 2f1–f2, consistent with previous studies. Both components were also present for 2f2–f1 in virtually all subjects. This latter finding conflicts with current models of DPOAE generation, and so a modified model is proposed. Unlike the 2f1–f2 emission, which has a wave-fixed component that is strongly dependent on the frequency ratio, neither component of the 2f2–f1 emission showed such a dependence. The proposed model explains these findings in terms of the overlap of the primary frequency traveling waves.

This record has no associated files available for download.

More information

Published date: 2006
Organisations: Human Sciences Group

Identifiers

Local EPrints ID: 43366
URI: http://eprints.soton.ac.uk/id/eprint/43366
ISSN: 0001-4966
PURE UUID: aa4f0490-bfc6-4813-b404-d60f52c0154d

Catalogue record

Date deposited: 23 Jan 2007
Last modified: 15 Mar 2024 08:54

Export record

Altmetrics

Contributors

Author: Hanna K. Wilson
Author: Mark E. Lutman

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×